Improvement in sandpapering-ivlachines



,0.BRt'f0KNBR. Sandpapering-Machine.

Patented Dec. 17,1878.

Vent 01" N PETERS, FHOI'D-LITHOGRAPHEK WASHINGTON. D C.

UNITED STATES CARL BRUOKNER, ()F CINCINNATI, OHIO, ASSIGNOR TO J. A. FAY& 00., OF SAME PLACE.

IMPROVEMENT EN SANDPAPERING=MACHNES.

Specification forming part of Letters Patent No. 210,9fi5, datedDecember 17, 1878 application filed April 22, 1878.

To all whom it may concern:

Be it known that I, CARL Bniionnna, of Cincinnati, Hamilton county,State of Ohio, have invented an Improvement in Sandpa pering-lllachines;of which the following is a specification My invention relates ingeneral to a sandpapering-machine having a revolving drum, upon which issecured the sheet or sheets of sandpaper, and which drum revolvesbeneath a table over which the stuff to be sandpapered is passed ordrawn by feed-rolls; and it refers more particularly to the manner ofconstructing the drum and the feed-rolls, and the adjustment of thevarious parts necessary to accommodate the polishing of difi'eringthicknesses of stuff.

My invention consists, in the first part, in providing the drum thatcarries the sand-paper with a peripheral coating of a soft andsensitively-flexible nature, composed of a proper admixture of glue andglycerine, over which to secure the sand-paper, the said covering to actas an accommodating force in keeping the sand-paper against the surfaceto be polished without crushing and destroying it.

My invention consists, in the second part, in order to enable the use ofsin gle feed-rolls, located only above the table, and thus avoidexpensive construction, in providing said rolls with a roughenedsurface, preferably a coating of emery, but, if desired, a coating ofpulverized glass, sand, or other like inexpensive material. From thismanner of constructing the feed-rolls they can feed the stuff along astationary supporting-surface, and at the same time avoid disfiguringthe surface of the stuff, as would be the case if notched or toothedrolls were used.

My invention consists, in the third part, in the provision, inconnection with the hand; screw for adjusting the position of thefeedrolls, and which connects centrally with the frame of the rolls, ofspring-buffers located to press against the roll-frame near itsextremities, and in the line of its adjustability, so that theirimpelling force will overcome all tend ency in the frame to stick orbind, and thus enable the adj ustingscrew to properly adjust theroll-frame.

My invention consists, in the fourth part, in the provision of a seriesof links binding together the train of gearing that connects thefeed-rolls with the shaft of the sand-paper drum, and a series ofadjustable supports to secure the links in rigid positions, the wholeenabling the adjustment of the feed-rolls without severing thedriving-connection, or enabling the throwing back of the table when fitting the drum with sand-paper.

Referring to the accompanying drawings, Figure 1 is a side elevation ofthe machine embodying my improvements. Fig. 2 is a sectional elevationof the same. Fig. 3 is a perspective view of the polishing-drum, showingthe sand-paper partly in position.

The main features of a sandpa-pering-machine are a roller, A, having acovering of sand-paper, and feed-rolls B B, to carry the stuff up to theroll A, which revolves against the direction of the passing stufi'. Thedrum A is journaled in a frame, (3, and upon an adjustable support, 0,made so bythe presence of the adjusting-screws c 0, so that the drum'maybe made to assume the right position relatively to the top surface ofthe table D, over which the stuff passes.

The drum A is made, preferably, with a wooden frame, to which is secureda continuous periphery of wood in small strips. Over this is wound acovering of cord, which forms a suitable surface for the elasticexternal coverin g of the drum to adhere to, it being molded thereto ina liquid state and allowed to set. This covering must be thoroughly andsensitively elastic, so that, while it will have sufficient power tokeep the sand-paper which is secured over it up to its work, it will notbe so unyielding as to bruise the sand-paper. Therefore it will not doto make the said covering of rubber, which, although being elastic, istoo tough and unyielding under moderate pressure. Hence I have employedan admixture of glue and glycerine, the former having a body which thelatter renders elastic and the whole may be easily molded upon the drum,while possessing that sensitive elasticity so essential in keepingthesand-paper to its work without crushing and destroying the surface ofthe said sand-paper before it has been consumed Iegiti mately inpolishin hinged at d, so that it may be thrown back, in

order to enable the securing of sand-paper upon the drum A when thelatter is inposition, this feature being convenient, owing to thefrequent necessity of applying the sand-paper.

The feed-rolls B B are equal in length to the width of the table, andare journaled above the table in sliding boxes in an adjustable frame,E. They are preferably made of wood and coated with pulverized emery,which surface enables them to gripe the stuff to be polished and carryit along the stationary supp orting-surface of the table D, as well aspast the oppositely-revolvin g polishing-drum A and thus they areenabled to perform the functions of'a toothedfeed-roll withoutthe sametendency to mar the surface of the stuff, while also dispensing with atraveling table-support or under rolls, which would be much moreexpensive.

In order to secure the proper space between table D and the feed-rolls BB for varying thicknesses of stuff, theframe E is secured upondovetailed inclined slides F F. These, in turn, are made horizontallyadjustable upon the table-frame D, to permit the location of the rollsin the right position over the druniA, which would be disturbed inarranging the space between the rolls and table.

The adjusting-screw G is secured in the" cross-piece of the slide-frameF F, and con meets with the cross-piece of the feed-roll frame E.Secured to move in openings in the slideframe F F, and press against theroll-frame E near its extremities, and in the line of its adjustment,are buffer-rods H H, having springs h h, to exert their power betweencollars h ht upon the rods and the slide-frame F F, and thus act toforce the said roll-frame along the slides. By this means the roll-frameis subject to an impelling force, which will overcome any tendency tobind or stick on the slides, and the single adjustingscrew is enabled toproperly adjust the frame. The collars h h" upon the rods H H are madeadjustable, to enable the proper tension to be given to the springs.

The drum-shaft is provided with a pulley, a, to receive power from thecounter-shaft, and a gear-wheel, a, which, with the gear-wheels I J K L,form aspeeded-down drivingconnection from said drum-shaft to thefeed-rolls. The wheel I is secured upon frame E to mesh with wheel Mupon one of the feed'roll shafts,

and also with wheel K, to which it is secured by link I. The wheel K is,in turn, secured to mesh with wheel J by the link 70, and the wheel L,being fastened rigidly to wheel J, so as to revolve with it, is securedto mesh with wheel a. on drum-shaft by link i. The wheel M upon one ofthe feed-rolls is connected by link m to mesh with pinion N, which, inturn, meshes with wheel 0 upon the other feed-roll shaft.

It will readily be seen that by means of this driving-connection thedistance between the drumshaft and feed-roll shaft may be increased. ordecreased at pleasure without severing the connection, which ischain-like in nature, and thus the position of the rolls may be variedat will in providing for the feeding of varying thicknesses of stuff; orthe table may be tilted back to enable the adjusting of sandpaper uponthe drum A.

In order to steady the linked driving-connection above mentioned, Iprovide adjustable supports]? Q, which support the shafts of the wheelsI1, J, and K. By means of tightening the set-screws p q, these supportsmay be made rigid when the machine is running, and by loosening saidset-screws the position of the feed-rolls or the table may be varied.

I claim 1. In a sandpapering or polishing machine, a polishing-rollerhaving a peripheral coating of glue rendered sensitively elastic byproper admixture of glycerine or kindred substance, the whole to act asa yielding surface upon which to secure the sand-paper.

2. In a sandpapering or polishing machine, the feed-rolls provided witha surface of pulverized emery, glass, or similar material, to serve thepurposes substantially as described.

3. The combination, with the feed-roll frame, slideways, and adjustingscrew, of sprin gbuffers arranged to press against the rollframe, in thedirection of its adj ustability, with power sufficient to overcome anytendency in the slide-connection to bind, whereby the adjusting-screw isenabled to accurately accomplish its office.

4. In a sandpapering or polishing machine, the feed-roll-drivingconnection from thence to the shaft of the polishing-drum, composed ofintermeshing gear-wheels hung permanently together by links andadjustable supports uponthe frame, whereby the links may be renderedrigidly stationary or at will released, to enable the adjustment of therolls withoutsevering the driving-connection.

In testimony of which invention I hereunto set my hand.

- CARL BRUOKNER.

Witnesses:

JOHN E. JoNEs, SAMUEL HUMPHREYS.

